Shoe shank insert



FIG. 1 is a top plan view of a shoe shank insert showing my new design, the bottom being substantially a mirror image thereto;

FIG. 2 is a left side elevational view thereof; the right side being a mirror image thereto;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top and left rear perspective view thereof. 

The ornamental design for a shoe shank insert, as shown and described. 